.container {
    width: 1000px;
    margin: 0 auto;
}

.banner, .footer{
    height: 100px;
    background: #CCCCCC;
}
.left {
    float: left;
    height: 300px;
    width: 400px;
    background: orangered;
}
.right {
    margin-left: 400px;
    width: 600px;
    height: 300px;
    background: lightseagreen;
}


